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device/cppcodec/base32_hex.hpp

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+/**
+ *  Copyright (C) 2015, 2016 Topology LP
+ *  All rights reserved.
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to
+ *  deal in the Software without restriction, including without limitation the
+ *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ *  sell copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ *  IN THE SOFTWARE.
+ */
+
+#ifndef CPPCODEC_BASE32_HEX
+#define CPPCODEC_BASE32_HEX
+
+#include "detail/codec.hpp"
+#include "detail/base32.hpp"
+
+namespace cppcodec {
+
+namespace detail {
+
+// RFC 4648 also specifies a hex encoding system which uses 0-9, then A-V.
+static constexpr const char base32_hex_alphabet[] = {
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',
+    'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V'
+};
+
+class base32_hex
+{
+public:
+    template <typename Codec> using codec_impl = stream_codec<Codec, base32_hex>;
+
+    static CPPCODEC_ALWAYS_INLINE constexpr size_t alphabet_size() {
+        static_assert(sizeof(base32_hex_alphabet) == 32, "base32 alphabet must have 32 values");
+        return sizeof(base32_hex_alphabet);
+    }
+    static CPPCODEC_ALWAYS_INLINE constexpr char symbol(alphabet_index_t idx)
+    {
+        return base32_hex_alphabet[idx];
+    }
+    static CPPCODEC_ALWAYS_INLINE constexpr char normalized_symbol(char c)
+    {
+        // Lower-case letters are accepted, though not generally expected.
+        return (c >= 'a' && c <= 'v') ? (c - 'a' + 'A') : c;
+    }
+
+    static CPPCODEC_ALWAYS_INLINE constexpr bool generates_padding() { return true; }
+    static CPPCODEC_ALWAYS_INLINE constexpr bool requires_padding() { return true; }
+    static CPPCODEC_ALWAYS_INLINE constexpr char padding_symbol() { return '='; }
+    static CPPCODEC_ALWAYS_INLINE constexpr bool is_padding_symbol(char c) { return c == '='; }
+    static CPPCODEC_ALWAYS_INLINE constexpr bool is_eof_symbol(char c) { return c == '\0'; }
+
+    // RFC4648 does not specify any whitespace being allowed in base32 encodings.
+    static CPPCODEC_ALWAYS_INLINE constexpr bool should_ignore(char) { return false; }
+};
+
+} // namespace detail
+
+using base32_hex = detail::codec<detail::base32<detail::base32_hex>>;
+
+} // namespace cppcodec
+
+#endif // CPPCODEC_BASE32_HEX